pwnbox flake

This archive is the pwnbox NixOS + home-manager flake as published on https://pwnbox.one.

Removed from the public archive:
- dotfiles/gnome/fonts/Berkeley Mono *  (commercial font, licensed per user; buy it at berkeleygraphics.com and drop the files back into dotfiles/gnome/fonts/)
- the lite archive also leaves out the wallpaper library in dotfiles/gnome/wallpapers/ (add your own images there; the four custom themes keep their wallpapers)

Install on an existing NixOS machine:
    ./install.sh switch

Manual: https://pwnbox.one/docs/
